Work and tool holder



H. BROOKER.

Patented Feb. 1,1921.

WORK AND TOOL HOLDER.

APPLICATION FILED NOV. 30,1318.

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` UNITED STATES PATENT OFFICE.

WORK AND TOOL HOLDER.

Specication of Letters Patent.

Patented Feb. 1, 1921.

Application filed November 30, 1918. Serial No. 264,810.

To all whom t may concern.'

Be it known that I, HENRY Brooklin, a subject of the King of Great Britain, residing at London, England, have invented certain new and useful Improvements in Vork and Tool Holders, of which the following is a specification. This invention relates to improvements in jaw chucks or` adjustable work and tool holders for lathes, drilling machines and the like, and is broadly of the class in which a movable jaw is adjustable on a guide in i a face plate, means being provided upon the jaw for engaging racks on the face plate whereby the jaw is clamped or locked to the iace plate. Screw means mounted in the aforesaid clamping means enable the loose jaw to be tightened up against a piece olf work.

among the objectsof the invention are to provide an improved jaw chuck or adjustable work and tool holder for lathes, drilling machines and the like, whereby manufacturing economies are promoted, the lixing of the work or tools facilitated, and the jaws made readily renewable.

rlhus under the present invention locking engagement between the locking member and the :tace plate is insured under all working conditions, as the means for opposing disengagement of the locking member from the face plate are so inter-related with the jaw that accidental release cannot take place or is made very diliicult. Further under the present invention by the positive connection existing between the jaw and the thrust member, the to and fro movement of the jaw is positive with or completely dependent on the motion of the thrust member. Thus fine radial or linear adjustment of the jaw both toward and away from the work is provided for. VIn an embodiment of the invention which posesses the advantages of compactness and structural strength an abutment on the jaw and an abutment on the locking member cooperate to oppose the` hereinafter be made to the accompanying drawings, showing two convenient forms of the improved jaw chuck by way of example.

Figure 1 is a side view and Fig. 2 a fragmentary front view of one form of the jaw chuck, showing one of the jaws out of engagement.

Fig. 3 is a sectional view through a modified form of jaw chuck.

As shown in Figs. l and 2 of the drawings the jaw chuck comprises a face plate a having radial T-shaped or other guides b adapted to engage an appropriately formed jaw o. The means for radial adj ustlnent of the jaw comprises a thrust member in the form of a screw l pivoted to the jaw at e and working in a locking member or nut f which 'forms the part adapted to be fixed to the face plate a.

The back or outer part of the jaw has a gap or recess g for the reception of the nut f which is adapted to slide in or out oi the gap g when the screw el is rotated, the screw being adapted for the reception of a suitable key and being swiveled at e by a ball and socket or other appropriate swivel attachment to enable the screw CZ to be rotated. As shown in Fig. l. the wall of the gap g may form anabutmcnt coperating with an abutment on the nut f to oppose tendency to flexure of the back of the jaw due to the thrust impartedthereto by the clamping of the work. l

The nut f is provided with locking means, for example, dog-pieces tadapted to engage racks lv along each side of the radial slot b, the teeth of the rack alternating with flat faces upon which the jaw may ride. The racks and dog-pieces are made so as to accommodate the thrust in either direction, according to whether the work is held from within or without.

The swivel-attachment e allows the nut f to be hinged away from the face plate a sufiiciently to allow the jaw and nut to be moved along the radial guide b to the desired locking position.

The jaw c may be provided with springplungers m or other means adapted to raise the nut f when the latter is moved out of the gap g, thus raising the dog-pieces It clear off the racks c and allowing the jaw to be moved to any desired position.

In the alternative construction according to Fig. 3, the nut f is fixed in a block f having a locking rib n engaging grooves o in the face plate a, thev block f being pressed into Contact with the 'face plate by a springplunger or like device p. The grooves 0 may be slightly undercut and tie rib n cor respondingly shaped but made slightlynarrower to enter the groove and prevent the jaw 'from forcible displacement when the chuck is in use.

' The aw chuck may be piovided with one or more fixed jaws and one or inoi'e movable jaws, the latter being constructed substantially as iereinbeiore described.

What l claim is l. In a work or tool holder, a face plate, guides on the face plate, a jaw movable on said guides, a thrust member pivoted to said jaw, a locking member on said thrust member adapted when the thrust member is swung down to make locking engagement with the face plate, means shitable into and out of operative engagement with the aw, opposing disengagement or" said locking member from the face plate, the jaw being adjustable with reference to the locking' member, both the to andtro adjustment of which-jaw is positive with or directly control-led by the thrust member. y

l In a work or tool holder, a tace plate, guides on theface plat-e, a aw movable on ysaid guides, a thrust member pivoted to said jaw, a locking member on said thrust member adapted when the thrust member is swung down to malte locking engagement with the face plate, an abutment on the jaw coperating with an abutment on the locking member when in operative engagement [for opposing disengagement ot said locking member from' the face plate, the jaw being 'adjustable with reference to the locking member, both the to and tro adjustment o'l whichjaw is positive with or directly controlled by thethrust member.

8. In a work or tool holder, a tace plate,

yguides on the tace plate, a jaw movable on said guides, a gap in the back of said jaw, arscrewed thrust member pivoted on said jaw, a nut threaded on said screwed meming with an abutment on the nut when in operative engagement for opposing dseiigagement of said dog pieces from the lace plate, the jaw beingadjustable with reference to the nut, both the to and tro adjustment oi which jaw is positive with or di- 'ectlj7 controlled b v the thrust member.

el. ln a work or tool holder as claimed in claim 23 hereoll the arrangement of nut and dog-pieces as a one-piece structure, substantially as described.

ln a work or tool holder, a lace plate, guides on the :tace plate, a jaw movable on said guides, a gap in the back of said jaw, a screwed thrust member pivoted on said jaw, a nut threaded on said screwed inember and adapted to slide in and out of said gap, racks on said face plate, dog pieces lined on said nut adapted lo engage said racks when the thrust member is swung down, abutments on the aw and the locking member for opposing disengagement ot said locking member from the la e plate and opposing the tendency to lexure ot the back of the jaw, tie jaw being adjustable with reference to the locking member, both the to and fro adjustment of which jaw positive with or directlyv controlled by the thrust member.

G. ln a worl: or tool holder, a face plate, guides on said face plate, a. jaw movable on said guides, a gap in the back ot said jaw, a screwed member pivoted to said jaw, a nut threaded on said screwed member and adapted to slide in and out oi said gap, racks on said tace plate, dog-pieces on said member adapted to engage said racls and spring means for raising said nut when the latter is at the outer extremity ot the gap.

In testimonyv whereof, l aliix my signa- 

